Windows 7 Activation - This copy of Windows 7 is not genuine

In Windows 7 forums, I see many posts from Windows 7 users who complain about "This copy of Windows 7 is not genuine" warnings and pop up on their PC.
It does not matter the Windows 7 edition of the related operating system. It might be either Windows 7 Ultimate or Windows 7 Home edition, or others.
Windows users want to remove Windows 7 This copy of Windows is not genuine warning messages from their computers on wallpaper or on desktop screen of their PCs.

The warning "This copy of Windows 7 is not genuine" means basically that you don't own a real registered Windows 7 operating system.
You might probably installed your Windows 7 operating system from setup images that are free available from common download sites.
Or you might be still using free Windows 7 download for trial purposes after the trial period has long ago ended.
One other reason can be that your Windows 7 product key can be stolen and has been released to public available sites for general usage.

What you can do to get rid of "This copy of Windows 7 is not genuine" warning and claim that you have a clean your own copy of Windows 7 bought from legal ways?
Here is a list of actions you can take that I will suggest Windows 7 users having trouble with this Windows 7 activation issue.

Trying once more your Windows 7 Product Key.
Using MGA Diagnostic Tool to resolve the problem.
Activate Windows 7 using Phone. Get help from support person on the phone if required.

Solutions for "This copy of Windows 7 is not genuine" problem

Activate Windows 7 by Phone
The basic solution that you might apply after re-typing your product key can be trying to activate Windows 7 on phone.
You can activate Windows 7 Activation wizard by running "slui.exe 4" on the RUN command. (slui.exe is Windows Activation Client program).
Then activate Windows 7 by phone by following the instructions guiding you on the Windows 7 Activation wizard screens.
Please refer to How To Activate Windows 7 by Phone Step-by-Step Guide for details on Windows 7 activation using phone.
You can also connect to a real support person on the phone if you can not activate Windows 7 activation by phone method.

Validate your Product Key once more
Try once more to type the Windows 7 product key that you own and claim your genuine Windows 7 setup.
If this simple solution works successfully to resolve the Windows activation problem, you will not have to deal with other works.
It is very common to mistype the long meaningless letters and numbers in the product key input area. So being sure that you type the correct Windows 7 product key in the activation screen will let you go one step further in the solution of "This copy of Windows 7 is not genuine" problem.